Is there anyway via shell command for 2013, to list for all mailboxes, whether they are subject to a size limit, i.e. 2GB per mailbox? Or details of the limit per mailbox? Ideally the shell command could list the current size of the mailbox in MB also.

is it generally seen as best practice to enforce a max mailbox size limit?                            

Get-Mailbox -ResultSize Unlimited | Get-MailboxStatistics | ?{$_.TotalItemSize -gt 2GB} | Select DisplayName,TotalItemSize

Above command will only get you the mailboxes that are greater than 2GB.

In case if you want query per database then you can use:

Get-MailboxStatistics -Database DBName | ?{$_.TotalItemSize -gt 2GB} | Select DisplayName,TotalItemSize

Hi,

If you want to verify the status of the mailbox quota for all the mailboxes that are hosted on a database, run the following command:

Get-MailboxStatistics -Database <var>DatabaseName</var> | ft displayname,*quota*,*size -AutoSize -Wrap

For mor information about this, please refer to:

http://support2.microsoft.com/kb/2819389/en-us

Regards,